机构地区:[1]苏州大学附属第二医院骨科,215004 [2]苏州大学附属第二医院放疗科,215004 [3]中国科学院深圳先进技术研究院转化医学中心,深圳518055
出 处:《中华实验外科杂志》2016年第7期1721-1726,共6页Chinese Journal of Experimental Surgery
基 金:国家自然科学基金(81171730、81171712、81472105);江苏省临床医学科技专项(BL2014040、B12012004);苏州大学附属第二医院优势临床学科群项目(XKQ2015003);苏州市科技发展计划指导项目(SYSD2015084);深圳市基础研究项目(JCYJ20150401150223631);广东省公益研究与能力建设项目(2015A020212030)
摘 要:目的观察低剂量电离辐射(LDI)对钛(Ti)颗粒干预成骨样细胞MC3T3-El后的影响。方法不同浓度Ti颗粒与MC3T3-E1细胞共同培养后,接受LDI干预,采用细胞计数试剂盒(CCK-8)、酶联免疫吸附试验法(ELISA)、碱性磷酸酶(ALP)试剂盒、实用荧光定量聚合酶链反应(Real—timePCR)及茜素红染色法检测MC3T3-El细胞的增殖、分化、矿化及炎性因子白细胞介素-6(IL-6)的表达。结果照射后24h,Ti颗粒各组细胞活性(0.78±0.03、0.61±0.04、0.63±0.07)与对照组(1.00±0.10)比较显著下降(P〈0.01),但LDI对细胞活性没有显著影响。LDI对MC3T3-El细胞的活性在照射48h和72h表现出抑制效应(P〈0.01)。照射后7d,照射各组Ⅰ型前胶原羧基端肽(PICP)的浓度[(3.97±1.00)、(3.70±2.00)、(3.78±0.39)、(2.22±1.53)ng/g]与假照射各组[(3.32±0.84)、(2.47±0.94)、(2.51±0.50)、(1.39±0.40).g/g]比较均升高,差异有统计学意义(P〈0.05);ALP结果显示照射后14d,各个Ti颗粒浓度组ALP活性[(0.0123±0.0002)、(0.0117±0.0006)、(0.0115±0.0006)、(0.0120±0.0002)μmol/(min·μg)]均高于似照射绢[(0.0108±0.0005)、(0.0091±0.0005)、(0.0095±0.0006)、(0.0101±0.0002)μmol/(min·μg)],差异均有统计学意义(P〈0.05)。Real—time PCR结果显示LDI可有效降低Ti颗粒刺激后MC3T3-E1细胞IL-6的表达(0.86±0.12,P〈0.05)。茜素红染色结果显示在Ti颗粒存在的情况下LDI仍具有促进矿化的效应。结论LDI早期会加重Ti颗粒对成骨样细胞增殖的影响,但在Ti颗粒存在的情况下仍具有促进成骨样细胞分化、矿化的作用,同时可下调Ti颗粒刺激后成骨样细胞IL-6的表达。Objective To test low dose irradiation (LDI) effect nn MC3T3 -E1 cells co-cul- tured with different concentration of titanium (Ti) particles. Methods MC3T3 - E1 cell was cultured with different coneentrations of Ti particles, then were irradiated with 0 and 0. 5 Gy X - rays. Cell viability was determined with the cell counting kit - 8 ( CCK - 8 ) assay. The procollagen 1C - terminal propeptide (PICP) concentration in the supernatant was determined by enzyme -linked immuno sorbent assay (ELISA) kit. Assessed alkaline phosphatase (ALP) activity by the ALP kit. The interleukin -6 (IL -6) expression were compared by real - time quantitative polymerase chain reaction ( Real - time PCR) and on day 14 assessed matrix mineralization by alizarin red stain. Results The viability of MC3T3 - E1 cell in the grous cultured with Ti patricles 24 h after irradiation (0. 78 ±0. 03, 0. 61 ±0. 04, 0. 63 ±0. 07) all were significantly inhibited compared with 0 Gy- Ti-0 group (1.00 ± 0. 10, P 〈 0. 01 ). After 48 h and 72 h, the cell viability was also significantly inhibited by LDI. The concentration of PICP concentration in the 0Gy-Ti-100 group [(1.39±0.40) ng/g] was still lower than that of the 0 Gy-Ti-0 group [ ( 3.32 ± 0. 84 ) ng/g, P 〈 0. 05 ] , and X - ray irradiation significantly elevated the PICP concentration [(3.97±1.00), (3.70±_2.00), (3.78±0.39), (2.22±1.53) ng/glcommapredwith0 Gy groups [(3.32±0.84), (2.47±0.94), (2.51±0.50), (1.39±0.40) ng/g]at 7 dpost-irradiation (P〈 0. 05 ). X -ray irradiation significantly elevated the ALP activity of each groups [ (0. 012 3 ± 0. 000 2 ), (0.011 7±0.0006), (0.011 5±0.0006), (0.0120±0.0002) p.mol/(min·μg)]compared with 0 Gy groups [ (0.0108± 0.0005), (0.009 1± 0.0005), (0.0095± 0.0006), (0.010 1± 0. 000 2 )μmol/(min. μg) ] at 14 d post - irradiation ( P 〈 0. 05 ). The expression of IL - 6 was significantly inhibited by X -ray
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